Riello TAU UNIT 100 Installer Manual

Type
Installer Manual

This manual is also suitable for

cod. 20144127 rev. 12 05/2023
TAU Unit 50 - 70 - 100 - 115 - 140
EN INSTALLATION AND MAINTENANCE MANUAL
2
RANGE
MODEL CODE
TAU Unit 50 20144105
TAU Unit 70 20144106
TAU Unit 100 20144107
TAU Unit 115 20144108
TAU Unit 140 20145135
Accessories
For a complete list of accessories and details of their compatibil-
ity, refer to the Catalogue.
ENGLISH
Dear heating engineer,
Congratulations on having chosen a R boiler. You have se-
lected a modern, quality product that is designed to give de-
pendable, efcient and safe service and to provide comfort in
the home for many years to come.
This manual provides information that is essential to the in-
stallation of the appliance. Used in conjunction with your own
knowledge and expertise it will enable you to install the appli-
ance quickly, easily, and correctly.
Please accept our thanks and our congratulations on your choice
of product.
Riello S.p.A.
CONFORMITY
TAU Unit boilers conform to the following directives:
Regulation (EU) 2016/426
Directive 92/42/EEC on efciency requirements
Electromagnetic Compatibility Directive 2014/30/EU
Ecodesign Directive 2009/125/CE for energy-related prod-
ucts
Regulation (EU) 2017/1369 Energy labelling
Low Voltage Directive 2014/35/EU
Delegated Regulation (EU) N. 811/2013
Delegated Regulation (EU) N. 813/2013.
At the end of its life, the product should be not be disposed of
as solid urban waste, but rather it should be handed over to a
differentiated waste collection centre.
This manual, Code
- Rev.
comprises
pages.
3
This manual, Code 20144127 - Rev. 12 (05/2023)
comprises 152 pages.
CONTENTS
The following symbols are used in this manual:
9 CAUTION! = Identies actions that require caution and ad-
equate preparation.
0 STOP! = Identies actions that you MUST NOT do.
This manual, Code
- Rev.
comprises
pages.
1 GENERAL INFORMATION ............................5
1.1 General Safety Information ......................5
1.2 Precautions..................................5
1.3 Description of the appliance .....................6
1.4 Safety and control devices.......................6
1.5 Identication ................................7
1.6 System layout ................................8
1.7 Technical specications.........................9
1.8 Circulation pump sizing........................ 10
1.9 Location of sensors ............................11
1.10 Control panel ................................11
2 INSTALLATION .....................................12
2.1 Unpacking the product ........................ 12
2.1.1 Positioning of labels .......................... 12
2.2 Overall dimensions and weights ................. 12
2.3 Moving and removing the packing ............... 13
2.4 Installation premises ......................... 14
2.4.1 Recommended minimum distances .............. 14
2.5 Installation in older systems and systems requiring
modernisation .............................. 14
2.6 Water connections ........................... 15
2.7 Gas connections ............................. 16
2.8 Flue gas vent and comburent air intake ........... 16
2.8.1 Technical specications of stack ................. 18
2.8.2 Connection to the stack ....................... 18
2.8.3 Preparation for the condensate drain .............20
2.8.4 Neutralising the condensate .................... 21
2.9 System lling and emptying .................... 21
2.9.1 CH frost protection ........................... 21
2.10 Wiring diagram .............................. 22
2.11 Electrical connections .........................24
2.12 Modulating circulation pump connection . . . . . . . . . . 25
2.13 PWM control signals ..........................25
2.14 0-10V circulation pump control ..................26
2.15 Electronic control ............................ 27
2.15.1 Menu structure ..............................28
2.15.2 Parameters' list ..............................34
2.16 Source water systems and congurations ..........43
3 COMMISSIONING AND MAINTENANCE...............53
3.1 Preparing for initial startup.....................53
3.2 Initial startup ...............................53
3.2.1 Switching the appliance on and off ..............53
3.2.2 Date and time setting .........................53
3.2.3 Password access .............................54
3.2.4 Setting the heating parameters..................54
3.2.5 Setting the domestic hot water parameters ........59
3.2.6 Scheduled programme ........................60
3.2.7 Thermal module information ...................63
3.2.8 Flow meter parameters conguration (accessory) ....64
3.2.9 Flow switch conguration......................64
3.3 Checks during and after initial start-up ...........64
3.4 Error List ...................................65
3.4.1 Permanent Errors ............................65
3.4.2 Temporary Errors.............................66
3.4.3 Warnings ..................................66
3.5 Conversion from one type of gas to the other .......67
3.5.1 Parameter conguration for changing the type of gas
used ......................................68
3.6 Adjustments ................................69
3.7 Temporary or short-term shut-down ..............71
3.8 Preparing for extended periods of disuse ...........71
3.9 Cleaning and maintenance ..................... 72
3.9.1 "Service reminder" function .................... 72
3.9.2 Annual cleaning ............................. 72
3.9.3 Removing the burner ......................... 73
3.9.4 Setting the electrodes ......................... 73
3.9.5 Boiler exchanger cleaning...................... 73
3.9.6 Condensate drain siphon cleaning ............... 74
3.9.7 External cleaning ............................74
3.10 Troubleshooting .............................75
4 CONFIGURATION OF CASCADED THERMAL UNITS...76
4.1 Conguration of the primary system ..............76
4.2 Conguration of the secondary system . . . . . . . . . . . . 77
4.3 Typical water system schematics and conguration of
cascaded thermal units .......................79
4.3.1 Block diagram 1..............................79
4.3.2 Electrical connections - Diagram 1................80
4.3.3 System parameters Block diagram 1 ..............87
4.3.4 Block diagram 2 .............................89
4.3.5 Electrical connections - Diagram 2 ...............90
4.3.6 System parameters Block diagram 2 ..............97
4.3.7 Block diagram 3 .............................99
4.3.8 System parameters Block diagram 3 ..............107
4.3.9 Block diagram 4 ............................ 109
4.3.10 Electrical connections - Diagram 4 ...............110
4.3.11 System parameters Block diagram 4 ..............117
4.3.12 Adjusting setpoint............................119
4
5 SYSTEM MANAGEMENT ...........................120
5.1 Communication between the thermal modules .....120
5.1.1 Cascade parameter setting .....................120
5.2 Bus connections .............................124
5.2.1 Zone control with Depending module .............125
5.2.2 Deleting dependent zone ......................125
5.3 Setting depending zone parameters ............. 126
5.4 Setting zone parameters (accessible only with
installer password) .......................... 126
5.4.1 Menu structure ..............................127
5.5 Setting zone's climatic curve parameters (accessible
only with installer password) .................. 128
5.6 Programming the zone . . . . . . . . . . . . . . . . . . . . . . . 128
5.7 Scheduling the time bands .................... 129
5.8 Information on the operation of the zone......... 129
5.9 Electronic control ........................... 130
5.9.1 Setting the main parameters ...................131
5.9.2 Par.73 – Managing, Stand-alone, Dependent mode. ..131
5.9.3 Par.147 – No. thermal modules ..................131
5.9.4 Par.7 – heating setpoint hysteresis ...............131
5.9.5 General operation............................131
5.10 Operation with primary circuit sensor .............131
5.11 Operation with secondary circuit sensor ...........131
5.12 Parameter 148: operating mode of the cascade......132
5.12.1 Par 148 = 1..................................132
5.12.2 Par 148 = 2 .................................132
5.12.3 Par 148 = 3 .................................132
6 MANAGING ADDITIONAL ZONE.....................133
6.1 Check zone with zone management electronic device
optional ...................................133
6.2 Setting parameters of the additional zone .........135
6.3 Setting zone parameters (accessible only with
installer password) ...........................135
6.3.1 Menu structure ............................. 136
6.4 Setting zone's climatic curve parameters (accessible
only with installer password) ...................137
6.5 Programming the zone . . . . . . . . . . . . . . . . . . . . . . . .137
6.6 Scheduling the time bands .................... 138
6.7 Information on the operation of the zone......... 139
7 SYSTEM MANAGER ...............................140
7.1 Putting into service .......................... 140
7.2 Temporary or short-term shut-down .............141
7.3 Preparing for extended periods of disuse ..........141
7.4 Cleaning ...................................141
7.5 Maintenance................................141
7.6 Useful information ...........................142
8 MODBUS CONNECTION............................143
9 WATER IN CENTRAL HEATING SYSTEMS ...........147
10 RECYCLING AND DISPOSAL .......................149
5
GENERAL INFORMATION
1 GENERAL INFORMATION
1.1 General Safety Information
9 After removing the packaging, check the condition and
completeness of the supply. If there are any problems, con-
tact the company R that sold the equipment.
9 This product must be installed by a legally qualied heat-
ing engineer. On completion of the installation, the install-
er must issue the owner with a declaration of conformity
conrming that the installation has been completed to the
highest standards in compliance with the instructions pro-
vided by R in this instruction manual, and that it con-
forms to all applicable laws and standards.
9 This product must only be used for the purpose for which it
is designed and made, as specied by R. R declines
all responsibility, contractual or other, for damage to prop-
erty or injury to persons or animals caused by improper in-
stallation, adjustment, maintenance or use.
9 The room where the boiler is installed must be proper-
ly ventilated to ensure a sufcient supply of air for correct
combustion.
9 In case of water leaks disconnect the equipment from the
power mains, close the water supply and promptly alert
Technical Assistance Service R or professionally qualied
personnel.
9 Regularly check that the condensate drain is free from ob-
struction.
9 Periodically check that operating pressure in the water cir-
cuit is over 1 bar but below the maximum limit specied for
the boiler. If this is not the case, contact Technical Assistance
Service R or a professionally qualied heating engineer.
9 Long periods of inactivity of the equipment imply the fol-
lowing operations to be carried out:
Set the main switch of the equipment to “0”
Set the main switch of the system to “OFF”
Close the fuel valves and the water valves of the thermal
system
Drain the central heating circuit if there is any risk of
freezing.
9 The product must be serviced at least once a year. Servicing
must be arranged in advance with the R Technical Assis-
tance Service.
9 This manual is an integral part of the appliance and must
therefore be kept with care and must ALWAYS accompa-
ny the boiler, even when it is passed on to another own-
er or user or transferred to another installation. If it is lost
or damaged, please contact your local Technical Assistance
Service R for a new copy.
9 This manual must be read carefully so as to ensure the cor-
rect and safe installation, operation and maintenance of
the appliance. The Owner must be adequately informed
and trained on how to operate the appliance. Make sure
that he/she is familiar with all the information required for
safe system operation.
9 The equipment, before being connected to the hydraulic
system and to the gas supply and being electrically pow-
ered can be exposed to temperatures ranging between 4°C
and 40°C. Once it is able to activate the antifreeze functions,
it can be exposed to temperatures within -20°C and 40°C
9 We recommend cleaning inside the exchanger once a year,
extracting jet and burner and removing any installation de-
bris by suction. This operation should be done by personnel
from the Technical Assistance Service only.
1.2 Precautions
The operation of any appliance that uses fuel, electrical power
and water demands that a number of fundamental safety pre-
cautions be respected:
0 Do not allow children or inrm persons to operate the sys-
tem unsupervised.
0 It is forbidden to use electrical devices or equipment, such
as switches, appliances, etc. if there is a smell of gas or un-
burnt products. If so:
Ventilate the room, opening doors and windows
Close the fuel shut-off cock
Report the fault immediately to the R's Technical As-
sistance Service or a professionally qualied heating en-
gineer.
0 Do not touch the boiler while barefoot or wet.
0 Any technical or cleaning operation is forbidden before:
removing the power supply by setting the main switch of
the equipment to (I) and the main switch of the system
to (OFF)
closing the water and fuel shut-off valves
0 Do not tamper with or adjust the safety or control devices
without prior authorisation and instructions from the man-
ufacturer.
0 Do not plug or block the condensate drain outlet.
0 Never pull, disconnect, or twist the electrical cables coming
from the appliance even if it is disconnected from the mains
electricity supply.
0 Do not obstruct or restrict the vents in the room where the
boiler is installed. Adequate ventilation is essential for cor-
rect combustion.
0 Do not expose the boiler to the elements. It is not designed
for use outdoors.
0 Do not switch off the appliance if the outdoor temperature
may drop to below ZERO (frost hazard).
0 Do not leave ammable containers and substances in the
room where the device is installed.
0 Do not dispose of packaging material into the environment,
or leave it within the reach of children, since it can become
a potential hazard. Dispose of packaging material in com-
pliance with applicable legislation.
0 It is forbidden to activate the equipment without water.
0 The equipment casing must not be removed by people
without specic qualication and expertise.
6
GENERAL INFORMATION
1.3 Description of the appliance
The condensing thermal unit TAU Unit is a hot water generator,
with high thermal efciency, for the heating of environments
and production of domestic hot water (DHW) coupled to an ex-
ternal heater.
The boiler body is in high alloy stainless steel and develops ver-
tically ensuring maximum duration and reliability, meeting at
the same time the most stringent national and European reg-
ulations on the emission of heavy metals in condensate drain
waters.
The double return hydraulic circuit (high or low temperature) fa-
vours temperature stratication inside the body and optimises
the performance.
The boiler body is covered in high density glass wool insulation
to reduce heat loss.
The pre-mixed microame burner with power modulation ratio
1:10 ensures low polluting emissions (NOx and CO) in compliance
with the most stringent European Regulations.
The thermoregulation with user interface and display in the
control panel TAU Unit allows managing the safety and control
devices in compliance with current regulation. By connecting
the external probe it is possible to activate the climatic control
function of the heating circuit, enhancing the seasonal energy
recovery characteristics.
The thermoregulation adapts with exibility to the different sys-
tem needs; for example, it is possible to increase the number
of heating circuits supplied with high and low temperature and
connect the devices TAU Unit in cascade (see accessories Cata-
logue).
1.4 Safety and control devices
The thermal unit TAU Unit is equipped with the most advanced
safety and regulation systems available on the market.
Each fault is signalled through a numeric error code displayed
on the screen and stops the equipment causing the automatic
closure of the gas valve.
The following are installed on the water circuit:
Safety thermostat: on the body of the generator, it inter-
venes to stop the appliance if the temperature exceeds
the threshold limit of 110°C.
Delivery temperature probe: immersion probe on the
delivery line of the generator is used by the regulator
to view and check the delivery water temperature and
check the correct switching on and off of the equipment
based on the programmed setpoint. The regulator uses
the same probe to stop the generator in case of overtem-
perature, before the triggering of the safety thermostat.
Return temperature probe: the contact probe placed
on the return line of the boiler is used by the regula-
tor to view the return water temperature with which it
calculates, together with the delivery temperature, the
temperature difference between delivery and return (t),
which allows regulating the modulation of the thermal
unit circulation pump in heating mode.
Flue gas thermostat: placed in the lower part of the
exchanger, it triggers with high ue gas temperature
(>75°C).
Flue gas probe: placed in the lower part of the exchang-
er, causes a temporary error if the temperature of the
combustion products exceeds 85°C, and a permanent
error if it exceeds 90°C.
Through specic inlets and outlets, the thermoregulation TAU
Unit allows managing the following optional safety devices out-
side the equipment:
INAIL safety devices: the safety devices (minimum pres-
sure switch and lockout pressure switch) present in the
INAIL kit (optional) must be connected to the specic in-
let indicated with "INAIL" in the terminal board. If one
of the connected devices triggers, the equipment is set
immediately to lockout status (permanent error) and can
be restarted only after removing the fault and manually
resetting the safety device.
Pressure transducer or water minimum pressure switch:
the connection of one of the two optional devices, to be
carried out by the installer, allows the thermoregulation
to continuously view and check the pressure of the pri-
mary circuit to start or stop the equipment in case of low
pressure.
LPG fuel shut-off solenoid valve: the thermoregulation,
via a programmable output, allows managing (based on
the designated type of fuel and system) the fuel shut-off
solenoid valve for LPG, installed outside the equipment
by the installer.
Gas minimum pressure switch: a specic outlet is pres-
ent for the connection of the gas minimum pressure
switch (optional) to be installed outside the equipment.
The device will continuously check the correct inlet gas
pressure to start or stop the equipment in case of low
pressure.
9 The triggering of the safety devices indicates a potentially
dangerous malfunctioning of the equipment. Therefore,
immediately contact the Technical Assistance Service.
9 Safety devices must be replaced by Technical Assistance
Service, using only original parts. Refer to the spare parts
catalogue supplied with the appliance. After the repair per-
form an ignition test and check that the equipment works
correctly.
0 The appliance must not be put in service, even temporarily,
when tampered safety devices are not in operation or have
been tampered with.
7
GENERAL INFORMATION
1.5 Identication
The products are identied by:
Data plate
This lists the technical specications and performance of the product.
230 V ~ 50Hz
Pms= bar T = °C
Qn(min)=
Pn(min)=
NOx (PCS):
mg/kWh
/
IP P.nom.G20= mbar
Qn(max=
Pn(max)=
Cod.
kW
kW
kW
kW
kW
kW
kW
kW
RIELLO S.p.A.
Via Ing.Pilade Riello 7
37045 Legnago (VR) - ITALY
Categoria:
Categorie:
Kategorie:
Combustible:
Brennstoff:
Combustibile:
Brandstof:
T067802GE
ηs= %
>
-
Max. flue gas loss: 7 %
W
Cod. N°
Qn(max)
Pms barkW
RIELLO S.p.A.
Via Ing.Pilade Riello 7
Mod.
37045 Legnago (VR) - ITALY
T067787I0
Central heating section
Qn Rated heat input
Pn Rated useful heat output
IP Electric degree of protection
Pms Maximum operating pressure, CH circuit
T Maximum permitted temperature
η Efciency
NOx NOx class
Serial number plate
Contains the serial number, the model and the main technical data.
9 If these plates or any other means of clearly identifying the product are defaced, removed or lost, proper installation and ser-
vicing may be rendered difcult.
8
GENERAL INFORMATION
1.6 System layout
1
4
2
5
3
20 21 22
7
8
9
6
10
13
12
11
14
15
16
17
18
19
1 Control panel
2 Electrical panel
3 Boiler body
4 Front panel
5 Condensate drain siphon
6 Fan
7 Ignition electrode
8 Flame inspection window
9 Combustion chamber pressure tap
10 Flue gas limit thermostat
11 Gas valve
12 Detection electrode
13 Automatic bleed valve
14 Main switch
15 Central heating ow
16 High temperature system return
17 Low temperature CH return
18 Exhaust ue probe
19 Wheels
20 Flue gas exhaust tting
21 Upper panel
22 Gas tting
9
GENERAL INFORMATION
1.7 Technical specications
DESCRIPTION TAU Unit
50
TAU Unit
70
TAU Unit
100
TAU Unit
115
TAU Unit
140
Appliance type
condensing boiler for central heating
B23, B23P, B53P, C13(*), C33(*), C43(*), C53(*), C63(*),
C83(*), C93(*)
Fuel
IT-CH-PT: G20=20mbar G31=37mbar
FR: G20/G25 - 20/25 mbar G31=37mbar
BE: G20/G25 - 20/25 mbar
DE: G20=20mbar G31=50mbar
Device category
IT-CH-PT: II2H3P
FR: II2Esi3P
BE: I2E(S)
DE: I2E, I3P
IT-CH-PT: II2H3P
FR: II2Esi3P
BE: I2E(R)
DE: I2E, I3P
Combustion chamber vertical
Maximum rated heat input at furnace referred to HVC (LCV) 55,4
(49,9)
77,6
(69,9) 111 (99,9) 127,7 (115) 155,4
(140) kW
Minimum rated heat input at furnace referred to HVC (LCV) 5,4 (4,9) 7,7 (6,9) 11,1 (9,9) 12,8(11,5) 15,5 (14) kW
Useful (rated) heat output 49 68 98 112 137 kW
Maximum rated heat output (80-60°C) P4 G20 48,4 68,0 97,5 112,0 136,8 kW
Maximum rated heat output (50-30°C) -G20 54,5 76,5 109,2 125,4 152,3 kW
Maximum nominal heat output (60-40°C) -G20 47,5 72,2 103,3 118,7 144,4 kW
30% heat output with return at 30°C P1 G20 16,4 22,7 32,5 34,5 45,7 kW
Minimum rated heat output (80-60°C) -G20 4,7 6,7 9,7 11 13,7 kW
Minimum nominal heat output (50-30°C) -G20 5,3 7,4 10,9 12,4 15,2 kW
Efciency class in central heating mode A A A A A
Seasonal energy efciency in central heating mode ηs93 93 93 93 93 %
Efciency at rated heat input and High temperature
GCV (NCV) regime η4
Useful
Pn (60-
80°C)
87,4
(97,1)
87,6
(97,3)
87,7
(97,5)
87,7
(97,4) 88 (97,7) %
Efciency at 30% of the nominal thermal ow and
on low PCS temperature regime η1
Useful
30% of
Pn
98,8
(109,7)
97,7
(108,5)
97,8
(108,6)
97,8
(108,7)
98
(108,8) %
Chimney losses with burner on at max. Pn (80-60°C) 2,8 2,6 2,4 2,5 2,1 %
Chimney losses with burner on at max. 30% Pn (50-30°C) 1,9 2,2 2,1 2,0 1,2 %
Heat loss in standby mode Pstby 54 74 107 107 112 W
0,1 0,1 0,1 0,1 0,1 %
Fan residual head (min/max) 3/175 4/145 5/170 6/150 6/230 Pa
Annual energy consumption QHE 151 212 303 347 424 GJ
Noise level (sound power) LWA at P
max 61 62 63 64 73 dB(A)
Emissions (**) Nox (referred
to HCV)
55
(class 6)
55
(class 6)
52
(class 6)
50
(class 6)
53
(Class 6)
mg/
kWh
Emissions at max./min. heat input, G20 CO2 9/9 (±0,1) 8.8/9
(±0.1) %
CO 5/5 7/7 4/4 4/4 3/8 ppm
Maximum rated heat input (LCV) G25 46 69,9 99,9 115 140 kW
Minimum rated heat input (LCV) G25 4,6 6,9 9,9 11,5 14 kW
Emissions at max./min. heat input, G25 CO2 9/9 (±0,1) 8.9/9.2
(±0.1) %
CO 5/5 7/7 4/4 4/4 9/8 ppm
Maximum rated heat input (LCV) G31 49,9 69,9 99,9 115 140 kW
Minimum rated heat input (LCV) G31 4,9 6,9 9,9 11,5 28 kW
Emissions at max./min. power G31 CO2 10/10 (±0,1) 9.9/10
(±0.1) %
CO 5/5 7/7 4/4 4/4 3/5 ppm
Flue gases temperature at P. max/P. min (80-60°C) 70/61 71/61 70/61 70/61 68/61 °C
Flue gases temperature at P. max/P. min (50-30°C) 40/31 °C
Mass ue gas ow rate at P. max e P. min (***) 23-2,3 33-3,3 47-4,7 55-5,5 64,2 -
12,8 g/s
(*) Congurations possible only with the installation of the dedicated accessories (available separately).
(**) Weighted values calculated according to standard EN 15502
(***) Values referred to atmospheric pressure at sea level.
10
GENERAL INFORMATION
DESCRIPTION TAU Unit
50
TAU Unit
70
TAU Unit
100
TAU Unit
115
TAU Unit
140
Maximum working pressure 5bar
Minimum supply pressure 1bar
Maximum permitted temperature 110 °C
Lockout thermostat activation temperature 110 °C
Adjustment temperature (min / max) 30/80 °C
Thermal module water content 91 99 130 130 290 I
Maximum condensation at 100% rated heat output (40-30°C) 811 14 15 18,5 l/h
Power supply 230-50 V-Hz
Index of protection X0D IP
Consumption at full load Elmax 100 150 230 230 270 W
Consumption at part load Elmin 40 50 60 60 65 W
Electrical consumption in standby mode Psb 18 W
1.8 Circulation pump sizing
This TAU Unit boiler comes without a pump. A pump must therefore be provided as part of the installation.
In order to choose a pump of the right size, bear in mind the boiler’s water-side pressure drop, as shown in the gure below.
Water-side pressure drop
Pressure drop (mbar)
300
200
100
350
250
150
50
00 4 6 8 102 12 14 16 18 20
22
50
75
25
0
0 2 3 4 51 6 7 8
TAU Unit 50
TAU Unit 50
TAU Unit 70
TAU Unit 100
TAU Unit 115
TAU Unit 140
TAU Unit 70
TAU Unit 140
TAU Unit 100
TAU Unit 115
Flow-rate (m3/h)
9 At the rst start-up, and at least once a year, the rotation
of the circulator shaft should be checked as, especially after
long periods of not being operated, deposits and/or residu-
als could impede its free rotation.
9 Before loosening or removing the circulator cap, protect the
electric devices located underneath from any water that ex-
its.
0 It is prohibited to operate the circulators without water.
11
GENERAL INFORMATION
1.9 Location of sensors
SENSORS INSERTED IN THEIR SOCKETS IN THE BOILER:
1 Exhaust ue probe
2 Safety thermostat
3 CH ow temperature sensor
4 Return probe
5 Flue gas limit thermostat
4
5
1
3
2
Rear view Front view
1.10 Control panel
04:29
12.0
°C
CH Setpoint
48.0
°C
21 3 4 5 6 7 98
11
12
13
10
CONTROL INTERFACE
1 255x80 point backlit display (106,4x39,0mm)
2 RESET key: restores normal operations after a safety
shut-down
3 MENU key: switches on the main menu
4 ESC key: in menu navigation, it enables you to exit a
menu item and go back to the previous one
5 ÷ 9 Navigation keys , , , ,
10 Main switch (placed on the rear panel of the
equipment)
DISPLAY VISUALISATION
11 Outdoor temperature
12 Setpoint
13 Clock
12
INSTALLATION
2 INSTALLATION
2.1 Unpacking the product
The thermal unit TAU Unit is supplied on pallet, protected by an
anti-scratch canvas and a wooden cage.
Check immediately that there is no damage and that the boil-
er is exactly as ordered. The product specications are shown
on the outside of the packing: model, power, equipment, fuel
type. If there is any difference between the boiler ordered and
that received, contact your agent, the warehouse or the sales
department at head ofce immediately.
Inserted in a plastic bag (1) inside the boiler (2), the following
material is supplied:
Instruction manual
Hydraulic test certicate
Energy label
Conventional warranty conditions
2.1.1 Positioning of labels
2
A
A
1
A Packing label
9 The instruction manual is an integral part of the appliance;
therefore, it should be read and stored carefully.
9 Keep the documentation envelope in a safe place. Any re-
placement documents must be ordered from Riello S.p.A.
who reserve the right to charge for the cost of the replace-
ment.
2.2 Overall dimensions and weights
TAU Unit
50
TAU Unit
70
TAU Unit
100
TAU Unit
115
TAU Unit
140
L (mm) 600 600 600 600 800
P (mm) 850 850 850 850 973
H (mm) 1550 1550 1750 1750 1885
Net weight
(kg) 155 165 243 243 400
L
P
13
INSTALLATION
2.3 Moving and removing the packing
9 Wear suitable personal protection equipment when moving
the boiler and removing the packing. Only use lifting equip-
ment that is suitable for the weight involved.
Remove the wooden cage (1)
Remove the angular protections in polystyrene (2)
Remove the protective bag (3).
1
4
5
3
22
1 Wooden crate
2 Edge protectors
3 Protective bag
4 Boiler
5 Pallet
9 The packaging material must be disposed of carefully and
must not be abandoned, as it is a source of potential dan-
ger.
Once you have removed the packaging, proceed as follows to
position the boiler:
Pull the front panel towards you then lift it up to remove
it
HANDLING WITH SUPPORT RAILS
Loosen the screws (6) fastening the pallet (5)
Insert two pieces of tube (7) with suitable length in the
relevant holes, letting them come out evenly from both
sides. Use the protruding lengths of pipe as lifting han-
dles.
6
5
7
9 Take care because the boiler might swing when lifted.
14
INSTALLATION
With at and smooth ooring and for small movements, the
thermal unit can be slightly lifted and moved through the
wheels (8).
8
Level the thermal unit by acting on the 2 feet on the front side
of the thermal unit.
2.4 Installation premises
Because this TAU Unit boiler generates over 35 kW of heat out-
put, it MUST be installed in a dedicated boiler room in compli-
ance with applicable technical standards. The boiler must also
be provided with a suitable condensate collection system and
ue gas vent system (see the relevant sections in this manual).
9 In Belgium, boilers must be installed according to standards
NBN D51.003, NBN B61.002 (heat output < 70 kW), and NBN
B61.001 (heat output >70 kW)
9 When installing the boiler, allow sufcient space around it
to access all safety and control devices and to permit easy
maintenance.
9 Check that the electric protection level of the appliance is
suitable for features of the room where it is installed.
9 Electrical parts must be placed at a height of no less than
500 mm from the ground where heating units are supplied
with fuel gas with specic weight exceeding that of air.
0 These boilers must be installed indoors. They are not de-
signed for outside use.
0 Do not obstruct or restrict the air vents in the room where
the boiler is installed. A free air supply is essential for correct
combustion.
9 Make sure that comburent air is not contaminated by sub-
stances containing chlorine or uorine (elements found in
sprays, paints, detergents etc.).
2.4.1 Recommended minimum distances
This gure shows the minimum distances that must be respect-
ed to allow installation and maintenance of the boiler.
≥ 0,8 m ≥ 0,8 m
≥ 1 m
≥ 1 m
The thermal module TAU Unit can be installed in rooms that are
permanently ventilated and equipped with suitably sized ven-
tilation openings in line with Technical Standards and Regula-
tions applicable to the installation site.
2.5 Installation in older systems and systems
requiring modernisation
When installing these boilers in older systems or systems requir-
ing modernisation, always perform the following checks:
The ue must be suitable for condensing devices, for the
temperature of the combustion products, calculated and
constructed according to current standards, and must be
as much straight as possible, sealed, isolated and with
no occlusions or chokes
Make sure that the ue is tted with a condensation
drainage union
Make sure that the electrical supply system has been in-
stalled by a qualied electrician in compliance with ap-
plicable standards
Make sure that the fuel feed line and any storage tank
are made and installed in compliance with applicable
standards
Make sure that the ow rate, head and direction of ow
of the pumps are suitable and correct
Make sure that expansion vessels are big enough to con-
tain the additional volume generated by thermal expan-
sion
Make sure that the central heating circuit has been
ushed out to remove all sludge and lime scale, and that
it has been bled and seal tested
A water treatment system must be provided (see chap-
ter "Water in central heating systems"). Refer to the R
catalogue for details of specic products.
9 The manufacturer declines all responsibility for damage
caused by incorrectly constructed ue systems.
15
INSTALLATION
2.6 Water connections
TAU Unit boilers are designed and made for installation in combined central heating and domestic hot water production systems.
The specications of the water ttings are as follows.
A B C
3
2
1
4
DESCRIPTION TAU Unit 50 TAU Unit 70 TAU Unit 100 TAU Unit 115 TAU Unit 140
Unit of
meas-
urement
A415 415 393 393 478 mm
B415 415 410 410 550 mm
C304 402 632 632 470 mm
1 - Central heating ow 1" 1/2 1" 1/2 2" 2" 2" 1/2 Ø
2 - High temp. system return 1" 1/4 1" 1/4 1" 1/2 1" 1/2 2" Ø
3 - Low temp. system return 1" 1/2 1" 1/2 2" 2" 2" 1/2 Ø
4 - Condensate outlet 22 22 22 22 22 Ø mm
NOTE: if the system only uses high temperature terminals, connect the system return to connection (3) for low temperature,
so as to use the whole exchange surface.
16
INSTALLATION
2.7 Gas connections
A
B
1
TAU
Unit
50
TAU
Unit
70
TAU
Unit
100
TAU
Unit
115
TAU
Unit
140
Unit of
meas-
ure-
ment
A1305 1405 1605 1605 1719 mm
B105 98 98 98 124 mm
1 - Gas
tting 1/2" 1/2" 3/4" 3/4" 1" Ø
TAU Unit boilers must be connected to a methane or LPG gas
supply in compliance with the relevant standards.
Perform the following checks before making the connection:
Check that the boiler is compatible with the type of gas
supply
Check that the gas supply pipes have been thoroughly
cleaned.
A lter of suitable particle rating should be installed.
9 The gas supply line must be suitable for the ow rate de-
manded by the burner. The gas supply system must also be
equipped with all the necessary safety and control devices
required by applicable legislation and standards.
9 On completion of the installation, check that all joints are
sealed.
2.8 Flue gas vent and comburent air intake
The equipment is supplied as standard in type B congura-
tion, hence prepared to suck air directly in the installation room
through the venting openings, that must be carried out in com-
pliance with the Technical Standards.
It can become a type C equipment with the use of specic ac-
cessories. In this conguration the equipment will suck air di-
rectly from the outside with the possibility to have coaxial or
split pipes.
For ue gas extraction and the intake of combustion air, it is
essential to use only specic pipes for condensing boilers and
ensure that they are correctly connected, as shown in the in-
structions supplied with the ue gas accessories.
Exhaust and suction ducts must always be carried out in com-
pliance with national, regional, provincial, etc. standards and
regulations in force (UNI - CIG).
The combustion gases are cooled to a temperature near that of
the central heating return before they leave the boiler body. This
makes it possible to use plastic ue pipes instead of metal ones,
with signicant savings in overall installation costs.
To protect the vent pipes against possible damage, TAU Unit
boilers are equipped with a ue gas temperature thermostat.
9 Do not connect this appliance's ue gas extraction pipes
with those of other appliances, unless this is specically
authorised by the manufacturer. Non-compliance with this
precaution may cause a build-up of carbon monoxide in
the room where the appliance is installed. This could jeop-
ardise people's health and safety.
9 Ensure that combustion air (suction line air) is not contam-
inated by:
waxes/chlorinated detergents
chemical products based on swimming pool chlorine
calcium chloride
sodium chloride use to soften tap water
refrigerant leaks
paint or varnish removers
chloridric acid/muriatic acid
cements and glues
anti-static softeners used in dryers
chloride used for domestic or industrial applications as
detergent, whitener or solvent
adhesives used to glue construction and other similar
products.
9 To prevent thermal unit contamination, do not install suc-
tion air intakes and ue gas exhaust ducts near:
dry-cleaners/laundry rooms and factories
swimming pools
metal processing plants
beauty parlours
fridge repair shops
photo-processing facilities
body-shops
plastics manufacturing plants
furniture workshops and manufacturing plants.
17
INSTALLATION
C
D
1
B
A
2
TAU
Unit
50
TAU
Unit
70
TAU
Unit
100
TAU
Unit
115
Unit of
meas-
ure-
ment
A100 mm
B515 mm
C100 mm
D763 764 mm
1 - Exhaust ue duct 80 110 Ø mm
2 - Rear ue gas dis-
charge (optional) 80 110 Ø mm
Flue gas discharge duct
through-wall hole 100 130 Ø mm
Air intake duct through-
wall hole 100 Ø mm
Coaxial ue gas dis-
charge/air intake for type
C congurations (option-
al)
80/125 110/160 Ø mm
Coaxial air intake/ue gas
discharge duct through-
wall hole
150 180 Ø mm
TAU Unit 140
Unit of
measure-
ment
A475 mm
B255 mm
C132 mm
D1215 mm
1 - Exhaust ue duct 110 Ø mm
2 - Set up for type C air
suction congurations
(accessory)
110 Ø mm
18
INSTALLATION
2.8.1 Technical specications of stack
The stack must satisfy the following requirements::
It must be constructed from materials that are imper-
meable to ue gases and that offer lasting resistance to
mechanical stress, heat and the action of the products of
combustion and condensate
It must be vertical, free of restrictions and contain bends
of no more than 4
It must be suitable for the specic operating conditions
of the boiler and must be CE marked
It must be of adequate dimensions to ensure draught
and venting properties suitable for the needs of the boil-
er
It must have adequate external insulation to prevent
condensation and the cooling of ue gases
the stack must have a dedicated condensate drain sys-
tem at the bottom.
9 The diameter of the smoke duct must never be smaller than
the diameter of the ue gas duct of the thermal unit.
9 In conguration B23, the stack must guarantee the mini-
mum draught specied by applicable technical standards,
assuming zero pressure at the boiler's ue gas exhaust.
2.8.2 Connection to the stack
The boiler must be connected to the stack using rigid ue pipes
that are resistant to heat, condensate and mechanical stress. All
joins must be sealed and the nished ue must be insulated.
The near-horizontal section of ue pipe must have a slope of at
least 5° towards the boiler and must also be properly insulated.
In long near-horizontal sections of ue pipe (L>1 m), install a
condensate drain system near the boiler exhaust (as shown in
the gure) to drain off any condensate forming in this section
of ue.
The diameter of the stack must always be greater than that of
the ue pipe from the boiler's exhaust tting. To change direc-
tion, use a T section with an inspection cap to permit easy access
for cleaning inside the pipe. After cleaning, always make sure
that inspection caps are replaced tightly and that their seals are
undamaged and efcient.
19
INSTALLATION
C13 C13
C13
C53 C63 C33 C43
B23
B23P
B53P
C93C83
B23 Upstream fan. Comburent air intake directly from the
room where the boiler is installed. Flue gas venting via
horizontal or vertical pipes, with air ventilation to room.
B23P As B23 but with ue gas vent pipes designed to operate
at positive pressure.
B53P As for B23P but with ue gas vent pipes supplied by
boiler manufacturer.
C13 Concentric wall vent. Twin ue pipes can also be used,
but the wall through-pipes must be concentric or
located close enough to be subjected to similar wind
conditions.
C33 Concentric roof vent. Twin ue gas vent pipes may be
used, but terminals must be concentric or near enough
to be subject to the same wind conditions (i.e. within a
100 cm square with a difference in height between the
pipes of less than 100 cm).
C43 Vent and air intake via separate twin pipes subject to
similar wind conditions.
C53 Separate wall or roof vent and air intake, in areas of
different pressure but never on opposite walls.
C63 Upstream fan. Boiler intended to be connected to a
system for the supply of combustion air and for the
evacuation of combustion products approved and sold
separately.
C83 Separate vent and inlet subject to natural draught. Wall
air inlet.
Vent to individual or shared chimney. Shared chimneys
must be insulated to prevent the formation of
condensation.
C93 Fan in combustion circuit upstream from the
combustion chamber/heat exchanger.
This conguration is used in older system upgrades
and with condensing boilers. It allows the system to
make use of an old air well, chimney or ue that would
otherwise be redundant.
9 See the specic standard for details. In Belgium, see
NBN-D51-003.
9 For B-type installation, combustion air is taken from the
environment and goes through the openings (shutters) on
the rear panel of the device that must be located in a suita-
ble and ventilated technical room.
9 Read the requirements, instructions and prohibitions de-
tailed below carefully, since non-compliance with them
may be result in a safety hazard or the appliance's malfunc-
tion.
9 Condensation appliances described in this handbook must
be installed with ue gas pipes compliant with applicable
legislation and expressly manufactured for this specic use.
9 Check that pipes and joints are not damaged.
9 Joint seals must be executed with materials that withstand
the condensate's acidity and the temperatures of the appli-
ance's ue gases.
9 When installing ue pipes, always bear in mind the direc-
tion of the ue gases and of possible condensate ows.
9 Inadequate or incorrectly sized ue gas pipes may increase
combustion noise, create condensate extraction issues and
negatively impact on combustion parameters.
9 Check that pipes are suitably far (min. 500 mm) from am-
mable or heat-sensitive construction elements.
9 Do not connect the vent ue directly to existing ues used
to serve other appliances (cookers, other boilers, etc.). Larg-
er disused ues can nevertheless be used as ducts for rout-
ing the boiler's intake and vent ues.
9 If the vertical section of vent ue is over 4 metres in height,
a condensate drain must be provided at its bottom (see par-
agraph "Preparation for the condensate drain“).
0 It is prohibited to block or section the ue gas extraction
pipe or the combustion air suction pipe, if any.
0 It is prohibited to use pipes that not designed for this ap-
plication, because the condensate's action would damage
them quickly.
20
INSTALLATION
Below are tables showing the maximum equivalent lengths for
the different available models.
EQUIPMENT CONFIGURATION TYPE B “OPEN”
Maximum equivalent length of ue gas
exhaust pipe 20(*) m
(*) This length must be reduced by 1 metre for every 90° curve
and by 0.5 metres for every 45° curve.
EQUIPMENT CONFIGURATION TYPE C “SEALED”
If comburent air is drawn from outdoors, the appliances are type
C "sealed" and the boiler room does not require ventilation.
9 For this conguration the settings of the parameters shown
in "Conguration of fan parameters for type C appliance
congurations” must be changed.
Split ducts
The boiler must be tted with the relevant kit for use in these
congurations. (See the manual provided with the kit for instal-
lation instructions).
Split ducts can be oriented in the direction most suitable to the
room needs, respecting the specied maximum lengths.
Maximum equivalent length of ue gas
exhaust pipe 10+10(*) m
(*) This length must be reduced by 1 metre for every 90° curve
and by 0.5 metres for every 45° curve.
Coaxial ducts
The boiler must be tted with the relevant kit for use in these
congurations. (See the manual provided with the kit for instal-
lation instructions).
Coaxial ues can be oriented in whatever direction is most con-
venient for the room, provided the maximum specied lengths
are respected.
Maximum equivalent length of ue gas
exhaust pipe 7(*) m
(*) This length must be reduced by 1 metre for every 90° curve
and by 0.5 metres for every 45° curve.
2.8.3 Preparation for the condensate drain
9 Always maintain a slope “i” of over 3° and ensure that the
diameter of any hose used is greater than that of the boiler’s
own condensate drain pipe.
9 The connection to the drainage system must be made ac-
cording to current laws in compliance with any local regu-
lations.
i
i
9 Fill the siphon with water before you start up the boiler to
prevent combustion gases escaping into the room during
the rst few minutes of boiler functioning.
9 Condensate from the boiler and from the ue should be
channelled to the same drain point.
9 The base of the equipment must be horizontal and levelled
in the frame resting area in order to let the condensate
evacuate easily.
drain
flue gas outlet
boiler
condensate
at discharge
or neutralisation
of condensate
flue
condensate
9 Any condensate neutralisation devices can be connected
after the siphon. For the calculation of the duration of the
neutralisation load, the amount of neutraliser consumption
must be evaluated after one year of operation. The total du-
ration of the load can be extrapolated from this information.
To select the type of neutralisation unit to use, consult the
Catalogue or contact the dealer who sold the boiler.
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Riello TAU UNIT 100 Installer Manual

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